28881253 has 4 divisors (see below), whose sum is σ = 29167308. Its totient is φ = 28595200.

The previous prime is 28881247. The next prime is 28881269. The reversal of 28881253 is 35218882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24137569 + 4743684 = 4913^2 + 2178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28881253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142876 + ... + 143077.

It is an arithmetic number, because the mean of its divisors is an integer number (7291827).

Almost surely, 2^28881253 is an apocalyptic number.

It is an amenable number.

28881253 is a deficient number, since it is larger than the sum of its proper divisors (286055).

28881253 is a wasteful number, since it uses less digits than its factorization.

28881253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286054.

The product of its digits is 30720, while the sum is 37.

The square root of 28881253 is about 5374.1281153318. The cubic root of 28881253 is about 306.8117659028.

The spelling of 28881253 in words is "twenty-eight million, eight hundred eighty-one thousand, two hundred fifty-three".